Stains
 

RUSTAIDE worked for me..............

Try SNOWCAP

SNO Cap is the best I found - tried several other products that didn't work well.

Go to Ace h hardware they sell a product that you spray k. And rinse off works well

Concrete Stains from irigation
 

ACE Hardware

We recently had our south of 44 driveway power washed by a purportedly reliable company. They made the driveway look worse and then proceeded to blame iron in the water, They then tried to use "different" chemicals and still left the driveway worse than when they started. Licensed insured and years in the business .. was a joke. Maybe they should have looked into this process.

My driveway is painted and the product I use did not affect the paint. Don't leave it on more than a few minutes.

Close, but a better product is this one that is made for outdoors. One thing I would caution, it is a strong acid. It has hydrofluoric acid, which is some nasty stuff. Wear gloves, spray it on and when the rust is gone rinse it off well.

I use this stuff up here in MA on my siding. My well water has horrible iron and this stuff is amazing. I tried all the other garbage, CLR, vinegar, etc. They are useless.

RustAid Goof Off Outdoor Rust Stain Remover, 1 Gal. - Removes Lime & Calcium, Scrub-Free - Ideal for Outdoor Surfaces in the Rust Removers department at Lowes.com

See above and also, no pool chlorine will not work, especially for rust/iron. Chlorine oxidizes iron and turns it that rust color. If you fill a pool with well water and add chlorine it quickly gets rusty. Go with the goof off stuff. But if it's painted I'd test it first in an inconspicuous spot.